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Perovskite‐Type Oxynitride Nanofibers Performing Photocatalytic Oxygen and Hydrogen Generation
Author(s) -
Hofmann Anja,
Weiss Morten,
Timm Jana,
Marschall Roland
Publication year - 2021
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202100813
Subject(s) - nanofiber , materials science , photocatalysis , electrospinning , chemical engineering , fiber , hydrogen , perovskite (structure) , ceramic , nanotechnology , composite material , catalysis , organic chemistry , polymer , chemistry , engineering
Ba 5 Nb 4 O 15 nanofibers with tailored nanofiber diameters are prepared via electrospinning, and treated in ammonia gas to synthesize niobate oxynitride nanofibers. Most importantly, the nanofibers retain their fiber morphology during ammonolysis, and the nanofiber diameter of the converted fibers can be adjusted. Only a thorough characterization, including detailed Rietveld refinements, can reveal that the ammonolysis of Ba 5 Nb 4 O 15 results not only in BaNbO 2 N, but also generates Ba 2 NbO 3 N as additional oxynitride phase. Such BaNbO 2 N–Ba 2 NbO 3 N composite nanofibers with adjusted nanofiber diameters are applied in photocatalytic water oxidation and hydrogen generation. After decoration with CoNbO 4 or Pt cocatalyst, the materials show a diameter‐dependent photocatalytic activity, respectively, with an optimum nanofiber diameter. The presented synthesis demonstrates a novel sol–gel‐derived possibility for nanostructuring of oxynitrides, which can pave the way for new synthesis strategies of nanostructured complex oxynitrides.